keygenerator.java

JAVA的 基础学习源代码. 有很好的帮忙!

/*
 * Cay S. Horstmann & Gary Cornell, Core Java
 * Published By Sun Microsystems Press/Prentice-Hall
 * Copyright (C) 1997 Sun Microsystems Inc.
 * All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this 
 * software and its documentation for NON-COMMERCIAL purposes
 * and without fee is hereby granted provided that this 
 * copyright notice appears in all copies. 
 * 
 * THE AUTHORS AND PUBLISHER MAKE NO REPRESENTATIONS OR 
 * WARRANTIES ABOUT THE SUITABILITY OF THE SOFTWARE, EITHER 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHORS
 * AND PUBLISHER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED 
 * BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING 
 * THIS SOFTWARE OR ITS DERIVATIVES.
 */
 
/**
 * This is an implementation of a proposed JCE class. 
 * Only those features that are necessary for the Core Java
 * CAESAR example have been implemented.
 * @version 1.00 10 Sep 1997
 * @author Cay Horstmann
 */

package java.security;

abstract public class KeyGenerator
{  public static KeyGenerator getInstance(String alg)
      throws NoSuchAlgorithmException 
   {  try 
      {  return (KeyGenerator)Security.getImpl(alg, 
            "KeyGenerator", null);
      } catch(NoSuchProviderException e) 
      {  throw new NoSuchAlgorithmException(alg);
      }
   }

   public abstract void initialize(SecureRandom r);
   public abstract Key generateKey();

   public KeyGenerator(String alg) { algorithm = alg; }
   
   private String algorithm;
}